Proline, leucine and phenylalanine metabolism in adult honeybee drones (Apis mellifica carnica Pollm)
1997
Berger, B. | Crailsheim, K. | Leonhard, B.
Amino acids labelled with 14C were injected into the haemolymph of hive drones (5 days old) and flight drones (12 days old). For a period of 4 h the animals were able to move and feed on honey in a vessel with a volume of 20 ml. Air was pumped through this vessel and bubbled through a CO2 adsorbent fluid, after which the radioactivity incorporated into protein, remaining in the haemolymph, and absorbed in the CO2-trap was determined. In hive and flight drones proline is present in greater concentrations in the haemolymph than phenylalanine (21:1; 31:1) or leucine (24:1; 76:1), and is used to a greater extent in oxidative metabolism than either phenylalanine (462:1; 222:1) or leucine (38:1; 394:1). Although the oxidative utilization of proline was high and was similar at both ages, hive drones used approximately 10 times more leucine than flight drones; the oxidative breakdown of phenylalanine in flight drones is higher than that of hive drones. Compared to the older drones, more phenylalanine, leucine and proline were incorporated into the body protein of the younger drones, indicating that there was a more intense protein synthesis during their earlier life stages.
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